1. The problem statement, all variables and given/known data Find the potential of the point in the origin in regard to referring point at infinity if there's charged line laying on x axis as shown in the picture. 2. Relevant equations 3. The attempt at a solution I know two ways to find a potential: V=∫dV and V=∫E*dl using first formula i have dv=dQ/4πε0r and i have Q=Q'dl but i don't know how to integrate that, i mean i have dl and i dont know what to do next.